Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 a9ed9ffb73e6e16c…

MALICIOUS

Office (OOXML) / .XLSX

649.7 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-05
MD5: 443c25b9285660d4d9e6db2da5d34070 SHA-1: 79cc4fc333900d72a10a977796cd1485e1bcbb03 SHA-256: a9ed9ffb73e6e16c3f15308036bc9ecabd1c8c0adbfbc842acfcd6f51d284c2f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file contains an embedded OLE object identified as an Equation Editor, which is a known vector for delivering malicious payloads. The heuristic 'OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY' indicates that the Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a declared inner size significantly larger than the actual stream size, suggesting obfuscation or a packed payload. This indicates the sample is designed to exploit vulnerabilities or deliver secondary malware through this embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/4L2Vvu.x1 contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
8714e0dba20a50d22674b4a72e19cff07d58023f9c8d0564bbd761aea159dffe		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/4L2Vvu.x1 880640 bytes
ooxml_oleobject_00_ole10native_00.bin
907ca8438191616cd3e2f7e670cfc675717ed6d50d336c64e25df60efa344e3a		 ole-package OOXML xl/embeddings/4L2Vvu.x1 Ole10Native stream: Ole10nATiVE 871360 bytes

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